Adjustable piston



G. M. HURLEY ADJUSTABLE PISTON Filed Sent. 19. 1921 Patented Aug. l2, W24.

GEORGE 1VI. HUBLEY, OF LOS ANGEIJEg, CALIFORNIA.

ADJUSTABLE PISTON.

Application filed September 19, 1921.

7 '0 all whom it may concern:

Be it known that I, GEORGE M. HURLEY, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Adjustable Piston, of which the following is a specification.

An object of this invention relates to internal combustion engines provided with a piston that is adapted to be expanded from time to time as occasion may require, to take up wear, and cause the piston to conform to the bore of the cylinder.

This invention is adapted to be carried out in various ways and I shall show the preferred form and one modification, but I do not limit myself to specific details of construction.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detail description and the appended claims.

The accompanying drawing illustrates the invention.

Figure 1 is an external view of the piston detached from the piston rod which is not shown.

Fig. 2 is a view of the open end or skirt of the piston with the expanding ring locked in place.

Fig. 3 is an enlarged longitudinal section on line 02 Figs. 1 and 2.

Fig. 4 is a section on line 00, Figs. 2 and 3, on the scale of Fig. 3, showing the piston inside the cylinder, a fragment of which is shown.

Fig. 5 is a fragmental view of the open end of the piston with expanding ring in place with the unlocking keys inserted preparatory to making an adjustment.

Fig. 6 is an enlarged view of one of the locking pins.

Fig. 7 is a fragmental view analogous to Fig. 3 showing a modification in the fragment of a cylinder.

The head or closed end 1 of the piston may be of any practical construction and may be provided with the piston ring grooves 2 in which the expansible piston rings 3 are seated.

The closed head 1 and theopen end 4 of the piston are made originally of the same external diameter and an intermediate reduced portion 6 is provided for a considerable distance on both'sides of the bearing 7 for the wrist pin 8.

Serial No. 501,532.

The skirt is slotted from the 0 on end to a considerable distance in the re uced portion 6. These slots may be variously arranged and are preferably aslant as indicated at 9 so that they extend spirally along the piston. These slots preferably terminate in enlarged orifices 10 which may serve to give splash feed lubrication to the cylinder. These orifices in combination with the slots also serve to revent pumping of the oil into the cylin er beyond the head of the piston.

The skirt is internally screw threaded with a taper 11 to receive the threaded expanding ring 12 which is tapered to correspond to the taper of the threaded portion of the skirt. Said expanding ring 12 is provided with spanner wrench holes 13 by which it may be turned in and out of the threaded seat, and said ring is also provided in its periphery with longitudinal cam grooves 14 to receive the locking rollers 15 which are rov'ided at their ends with seats 16 spaced apart accordin to the gage of the screw so that both hea s will travel in the threads.

The cam grooves 1 1 are reversely arranged so that any. tendency of the ring to rotate in one direction will be caught by one of said locking rollers and the tendency of the ring to turn in the other direction relative to the piston will be caught by the other roller.

In Fig. 5 the unlocking keys 17 are shown in place to prevent the heads of the looking rollers from engaging the internal threads of the skirt during an adjusting movement turn of the expanding ring 12.

In practice, to assemble the parts, the locking rollers 15 will be inserted into the cam grooves 14 therefor, and the keys 17 will be inserted with the ring and the rollers into the threaded skirt and when the piston is inserted into the cylinder 5 the ring will be screwed home to expand the skirt piston to the desired extent so as to fit the cylinder walls practically. Then the keys 17 are removed and when the pistons and cylinders are in operating positlon the heads 16 of the rollers will engage between the threads 11 of the skirt, thus to prevent the ring from being shifted by vibrations of the piston.

The reverse arrangement of the cam grooves causes the ring to be locked by said rollers against both right and left rotation.

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In the form shown in Fig. 7 the taper expanding ring 18 is externally smooth and fits inside the internally smooth taper bore 19 of the skirt; and stud bolts 20 screwed into sockets 21 in the piston, extend through the expanding ring 18 and are fitted on their outer ends with nuts 22 by which the ring may be drawn into' the skirt for the purpose of expanding the same.

I claim:

1. A piston provided with a slotted skirt having an internally screw threaded taper seat; a taper expanding ring screwed into said seat and provided with longitudinal cam grooves, locking rollers in saidgrooves provided with heads adapted to enter the spaces between the threads of the screw threaded seat for the purpose of locking the ring against rotation in said seat.

2. A piston provided with a slotted skirt having an internally screw threaded taper seat; a taper expanding ring screwed into said seat and provided with lon itudinal cam grooves, locking rollers in sai grooves provided with heads adapted to enter the spaces between the threads of the screw threaded seat for the purpose of locking the ring against rotation in said seat; and removable pins adapted to the cam grooves to hold the heads of the rollers out of contact with the threads of the taper seat so as to allow the expanding ring to be turned.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 9th day of September, 1921.

GEORGE M. HURLEY.

Witness:

JAMES R. TOWNSEND. 

